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In a study, we would like to detect a 12% reduction in the risk of hypertension in the intervention group as a result of a behavioral therapy as

In a study, we would like to detect a 12% reduction in the risk of hypertension in the intervention group as a result of a behavioral therapy as compared to the control group that did not receive the behavioral therapy. According to a prior study, the prevalence of hypertension in the population was 20%.

Using the power chart, calculate the sample size for 60% power.

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